Loans, Trouble Debt Restructuring (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Recidivism receivables [Abstract]
Total recidivism, Number of contracts	0	0	1	3
Total recidivism, Recorded investment	$ 0	$ 0	$ 50	$ 111
Interest Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts	0	0	1	5
Pre-modification Outstanding Recorded Investment	0	0	48	5,912
Post-Modification Outstanding Recorded Investment	0	0	48	5,912
Term Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts	1	1	4	1
Pre-modification Outstanding Recorded Investment	62	47	231	47
Post-Modification Outstanding Recorded Investment	62	47	231	47
Real estate loans [Member] | Residential mortgages [Member] | Interest Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts			1
Pre-modification Outstanding Recorded Investment			48
Post-Modification Outstanding Recorded Investment			48
Real estate loans [Member] | Residential mortgages [Member] | Term Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts			1
Pre-modification Outstanding Recorded Investment			71
Post-Modification Outstanding Recorded Investment			71
Real estate loans [Member] | Commercial [Member]
Recidivism receivables [Abstract]
Total recidivism, Number of contracts	0	0	1	2
Total recidivism, Recorded investment	0	0	50	109
Real estate loans [Member] | Commercial [Member] | Interest Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts	0	0	0	5
Pre-modification Outstanding Recorded Investment	0	0	0	5,912
Post-Modification Outstanding Recorded Investment	0	0	0	5,912
Real estate loans [Member] | Commercial [Member] | Term Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts	1	1	3	1
Pre-modification Outstanding Recorded Investment	62	47	160	47
Post-Modification Outstanding Recorded Investment	62	47	160	47
Commercial and other loans [Member]
Recidivism receivables [Abstract]
Total recidivism, Number of contracts	0	0	0	1
Total recidivism, Recorded investment	$ 0	$ 0	$ 0	$ 2